Oui le serveur provisoire n'avait pas de reverse. Le serveur actuel à un reverse IPv4 correct depuis plus de 7ans et IPv6 depuis 4ans.
Voici le type d'erreur que je retrouve dans Mailq : (j'ai supprimé les doubles)
On note que les e-mails sont rarement gérés en IPv6 (gmail est le seul IPv6 de la liste)
(connect to smtp.pregonetwork.net[82.243.188.209]:25: Connection timed out)
(conversation with mx4.ovh.net[213.186.33.74] timed out while receiving the initial server greeting)
(delivery temporarily suspended: conversation with mx4.ovh.net[213.186.33.74] timed out while receiving the initial server greeting)
(delivery temporarily suspended: host mailin-04.mx.aol.com[152.163.0.100] refused to talk to me: 421 mtaig-aak02.mx.aol.com Service unavailable - try again later)
(delivery temporarily suspended: host mx00.caramail.com[212.227.15.30] refused to talk to me: 554-gmx.net (mxgmx009) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx00.caramail.com[212.227.15.30] refused to talk to me: 554-gmx.net (mxgmx013) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx003) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx005) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx006) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx008) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx010) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx01.1and1.fr[217.72.192.67] refused to talk to me: 554-kundenserver.de (mxeue106) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx01.caramail.com[217.72.192.76] refused to talk to me: 554-gmx.net (mxgmx101) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx01.caramail.com[217.72.192.76] refused to talk to me: 554-gmx.net (mxgmx109) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx01.caramail.com[217.72.192.76] refused to talk to me: 554-gmx.net (mxgmx111) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host mx01.gmx.net[212.227.17.4] refused to talk to me: 554-gmx.net (mxgmx101) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(delivery temporarily suspended: host smtp-in.sfr.fr[93.17.128.123] refused to talk to me: 554 05/07/01 Client host rejected: cannot find your reverse hostname, [194.158.119.186])
(delivery temporarily suspended: host smtp-in.sfr.fr[93.17.128.165] refused to talk to me: 554 05/07/01 Client host rejected: cannot find your reverse hostname, [194.158.119.186])
(host dbox.crifo.org[163.172.198.88] said: 450 04/07/01 Client host rejected: cannot find your reverse hostname, [194.158.119.186] (in reply to RCPT TO command))
(host gmail-smtp-in.l.google.com[2a00:1450:400c:c0b::1b] said: 452-4.2.2 The email account that you tried to reach is over quota. Please direct 452-4.2.2 the recipient to 452 04/02/02 https://support.google.com/mail/?p=OverQuotaTemp x7si4420488wjf.26 - gsmtp (in reply to RCPT TO command))
(host gmail-smtp-in.l.google.com[74.125.133.26] said: 452-4.2.2 The email account that you tried to reach is over quota. Please direct 452-4.2.2 the recipient to 452 04/02/02 https://support.google.com/mail/?p=OverQuotaTemp o76si5208234wmi.60 - gsmtp (in reply to RCPT TO command))
(host mail2-smtp-roc.national.inria.fr[192.134.164.81] refused to talk to me: 554-mail2-smtp-roc.national.inria.fr 554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.)
(host mailin-01.mx.aol.com[152.163.0.99] refused to talk to me: 421 mtaig-aao04.mx.aol.com Service unavailable - try again later)
(host mailin-02.mx.aol.com[152.163.0.68] refused to talk to me: 421 mtaig-aaa02.mx.aol.com Service unavailable - try again later)
(host mailin-02.mx.aol.com[152.163.0.68] refused to talk to me: 421 mtaig-aae01.mx.aol.com Service unavailable - try again later)
(host mailin-03.mx.aol.com[64.12.88.163] refused to talk to me: 421 mtaig-mcb01.mx.aol.com Service unavailable - try again later)
(host mailin-04.mx.aol.com[152.163.0.100] refused to talk to me: 421 mtaig-aak02.mx.aol.com Service unavailable - try again later)
(host mailin-04.mx.aol.com[152.163.0.67] refused to talk to me: 421 mtaig-aal02.mx.aol.com Service unavailable - try again later)
(host mx00.1and1.fr[212.227.15.41] refused to talk to me: 554-kundenserver.de (mxeue006) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx00.caramail.com[212.227.15.30] refused to talk to me: 554-gmx.net (mxgmx009) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx00.caramail.com[212.227.15.30] refused to talk to me: 554-gmx.net (mxgmx013) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx003) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx005) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx006) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx00.gmx.net[212.227.15.10] refused to talk to me: 554-gmx.net (mxgmx008) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx01.1and1.fr[217.72.192.67] refused to talk to me: 554-kundenserver.de (mxeue104) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx01.1and1.fr[217.72.192.67] refused to talk to me: 554-kundenserver.de (mxeue105) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx01.caramail.com[217.72.192.76] refused to talk to me: 554-gmx.net (mxgmx101) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx01.caramail.com[217.72.192.76] refused to talk to me: 554-gmx.net (mxgmx109) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx01.caramail.com[217.72.192.76] refused to talk to me: 554-gmx.net (mxgmx111) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx01.gmx.net[212.227.17.4] refused to talk to me: 554-gmx.net (mxgmx101) Nemesis ESMTP Service not available 554-No SMTP service 554 invalid DNS PTR resource record, IP=194.158.119.186)
(host mx1.mail.ovh.net[178.33.124.171] said: 450 04/07/01 Client host rejected: cannot find your reverse hostname, [194.158.119.186] (in reply to RCPT TO command))
(host smtp2.lerelaisinternet.com[194.206.126.203] said: 450 04/07/01 Client host rejected: cannot find your reverse hostname, [194.158.119.186] (in reply to RCPT TO command))
(host smtp-in.sfr.fr[93.17.128.123] refused to talk to me: 554 05/07/01 Client host rejected: cannot find your reverse hostname, [194.158.119.186])
(host smtp-in.sfr.fr[93.17.128.165] refused to talk to me: 554 05/07/01 Client host rejected: cannot find your reverse hostname, [194.158.119.186])